Optical Fingerprint Module With OLED Display Integration
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Solution Overview
Problem
Existing optical fingerprint modules have limited functionality and application due to their single-purpose design, which restricts their use in integrating fingerprint capturing and information display functions effectively.
Innovation Solution
The integration of an Organic Light Emitting Diode (OLED) display panel with an optical fingerprint sensor, where light from a backlight source passes through non-opaque regions to capture fingerprint images, allowing for simultaneous fingerprint capturing and information display by adjusting the operating times of the sensor and display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an optical fingerprint sensor is used for fingerprint capturing, then fingerprint identification function is achieved, but the device lacks information display function
Solution Approach 1:
The patent combines the fingerprint sensor and OLED display into a single integrated module where the OLED serves dual purposes: as a display component and as part of the optical path for fingerprint capture. The OLED's transparent or translucent regions allow light to pass through for fingerprint imaging while maintaining display functionality, thus merging two functions into one structure.
Solution Approach 2:
The OLED display panel is designed to perform multiple functions: it displays information to the user and simultaneously serves as an optical component in the fingerprint sensing system. The transparent OLED regions allow light transmission for fingerprint capture while the display regions provide information output, making the single component universal for both display and sensing purposes.
2Adaptability or versatility
If the OLED display panel is integrated with the fingerprint sensor, then information display function is added, but light transmission for fingerprint capture may be affected
Solution Approach 1:
The OLED display panel is designed with different regions having different optical properties: transparent or translucent regions where fingerprint capture is needed, and opaque display regions for information presentation. This local differentiation ensures that light transmission is maintained in the fingerprint capture areas while preserving display functionality in other areas.
Solution Approach 2:
The OLED display is segmented into multiple regions with different functions: transparent regions for light transmission during fingerprint capture, display regions for showing information, and potentially mixed regions. This segmentation allows each region to optimize its specific function without compromising the other.
3Volume of moving object
If the distance between the optical fingerprint sensor and OLED display panel is reduced, then the module size is minimized, but optical path length for fingerprint capture is shortened
Solution Approach 1:
The patent optimizes the optical path by utilizing the vertical dimension and angular relationships rather than relying solely on horizontal distance. The light path is designed to travel through multiple interfaces and layers, using refraction and reflection angles to achieve sufficient optical path length within a compact form factor.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This integration enhances the functionality of the optical fingerprint module, enabling it to perform both fingerprint capturing and information display functions effectively, broadening its application range while maintaining high-resolution fingerprint imaging.
Implementation Method 1
An output light 111 of the backlight source 110 (upward arrows in FIG. 1 represent the output light 111, as enclosed in a dotted line frame)
Implementation Method 2
is reflected and transmitted at a contact interface between the finger 140 and the protective layer 130. The reflected light 112 (downward arrows in FIG. 1 represent the reflected light 112, as enclosed in a dotted line frame)
Implementation Method 3
The optical fingerprint sensor 120 performs photoelectric conversion and signal processing by its inner circuits (not shown in FIG. 1) to realize fingerprint image capturing
Data Source
AI summary
An optical fingerprint module includes a backlight source, an optical fingerprint sensor including a first surface, a second surface, at least one first non-opaque region and photosensitive pixels, and an OLED display panel including a third surface, a fourth surface and at least one second non-opaque region. The optical fingerprint sensor is disposed between the OLED device panel and the backlight source. Light emitted from the backlight source at least partially passes through the first non-opaque region from the first surface and reaches the second surface, transmits from the second surface to the third surface, passes through the second non-opaque region and reaches the fourth surface. The light reaching the fourth surface is at least partially reflected to be applied to capture a fingerprint image, the reflected light returns to the second non-opaque region, reaches the third surface, transmits to the second surface, and enters the photosensitive pixels.